Biomechanical study of lumbar spondylolysis and spondylolisthesis single vertebrae reduction fixation system
- VernacularTitle:腰椎峡部裂及滑脱单椎体复位固定系统的生物力学研究
- Author:
Zhonglai QIAN
;
Tiansi TANG
;
Huilin YANG
- Publication Type:Journal Article
- Keywords:
Lumbar vertebrae;
Spondylolysis;
Spondylolisthesis;
Internal fixators;
Biomechanics
- From:
Chinese Journal of Orthopaedics
2001;0(08):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective To evaluate biomeehanic characteristics of lumbar spondylolysis and spondylolisthesis single vertebrae reduction fixation system (LSRF), and discuss its mechanism of reduction. Method Twenty-four adult isthmus lumbar vertebrae specimen were disconnected and fixed with LSRF, Hefti, Salib's method respectively, and the biomechanic characteristics of the fixation devices were tested. Isthmus of L5 in 4 adult spine specimen was destroyed under loading to produce the spondylolisthesis model, and reduction by LSRF. Result The LSRF has a good ability for reduction and its strength for reduction is 1.6, 2.7 times as high compared with the Hefti, Salib's methods respectively. The mechanism of reduction is that the LSRF used contacted point of lamina by lamina hook as the fulcrum, through the pedicle screw to pull the spondylolisthetic vertebrae, and reduce the anterior displacement of vertebrae. Conclusion LSRF gives rigid fixation and good reduction, and provides a new and effective method for lumbar spondylolysis and isthmic spondylolisthesis.
